Gardaí arrested three people for public order offences during protests at the entrance to the Corrib gas terminal site, at Bellanaboy near Belmullet, this morning.
Members of the Shell to Sea campaign group, which is opposing the terminal, have been staging a series of protests to oppose the terminal since 7.30am.
The first sit-down protest took place at a bridge on the road leading to the site. A second demonstration was taking place at the main gates.
The cost of policing demonstrations at the Corrib gas terminal site up to yesterday was €675,000, and it could reach almost €750,000 by the weekend.
The figures were provided by the Department of Justice in reply to a written Dáil question by the Independent TD, Dr Jerry Cowley, who said that Shell should bear the cost.